ppmtoilbm
convert a portable pixmap into an ILBM file
see also :
ilbmtoppm
Synopsis
ppmtoilbm
[-maxplanes|-mp N]
[-fixplanes|-fp N]
[-ham6|-ham8]
[-dcbits|-dcplanesrgb]
[-normal|-hamif|-hamforce|-24if|-24force|
-dcif|-dcforce|-cmaponly]
[-ecs|-aga]
[-compress|-nocompress] [-cmethod
type] [-mapppmfile] [-savemem]
[ppmfile]
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description
Reads a
portable pixmap as input. Produces an ILBM file as output.
Supported ILBM types are:
Normal ILBMs with 1-16 planes.
Amiga HAM with 3-16 planes.
24 bit.
Color map (BMHD + CMAP chunk only, nPlanes = 0).
Unofficial direct color.
1-16 planes for each color
component.
Chunks written:
BMHD, CMAP, CAMG (only for
HAM), BODY (not for colormap files) unofficial DCOL chunk
for direct color ILBM
options
Options marked
with (*) can be prefixed with a "no", e.g.
"-nohamif". All options can be abbreviated to
their shortest unique prefix.
-maxplanes | -mp n
(default 5, minimum 1, maximum
16) Maximum planes to write in a normal ILBM. If the pixmap
does not fit into <n> planes, ppmtoilbm writes a HAM
file (if -hamif is used), a 24bit file (if -24if is used) or
a direct color file (if -dcif is used) or aborts with an
error.
-fixplanes | -fp n
(min 1, max 16) If a normal
ILBM is written, it will have exactly <n> planes.
-hambits | -hamplanes
n
(default 6, min 3, max 16)
Select number of planes for HAM picture. The current Amiga
hardware supports 6 and 8 planes, so for now you should only
use this values.
-normal (default)
Turns off -hamif/-24if/-dcif,
-hamforce/-24force/-dcforce and -cmaponly. Also sets
compression type to byterun1.
-hamif (*)
-24if (*)
-dcif (*)
Write a HAM/24bit/direct color
file if the pixmap does not fit into <maxplanes>
planes.
-hamforce (*)
-24force (*)
-dcforce (*)
Write a HAM/24bit/direct color
file.
-dcbits | -dcplanes r g
b
(default 5, min 1, max 16).
Select number of bits for red, green & blue in a direct
color ILBM.
-ecs (default)
Shortcut for: -hamplanes 6
-maxplanes 5
Shortcut for: -hamplanes 8
-maxplanes 8
Shortcut for: -hamplanes 6
-hamforce
-ham8
Shortcut for: -hamplanes 8 -hamforce
-compress (*) (default)
-cmethod none|byterun1
Compress the BODY chunk. The
default compression method is byterun1. Compression requires
building the ILBM image in memory; turning compression off
allows stream-writing of the image, but the resulting file
will usually be 30% to 50% larger. Another alternative is
the -savemem option, this will keep memory requirements for
compression at a minimum, but is very slow.
-map ppmfile
Write a normal ILBM using the
colors in <ppmfile> as the colormap. The colormap file
also determines the number of planes, a -maxplanes or
-fixplanes option is ignored.
-cmaponly
Write a colormap file: only
BMHD and CMAP chunks, no BODY chunk, nPlanes = 0.
-savemem
See the -compress option.
references
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
Addison Wesley, ISBN 0-201-56775-X
bugs
HAM pictures
will always get a grayscale colormap; a real color selection
algorithm might give better results. On the other hand, this
allows row-by-row operation on HAM images, and all HAM
images of the same depth (no. of planes) share a common
colormap, which is useful for building HAM animations.
see also
ppm,
ilbmtoppm
authors
Copyright (C)
1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken
(Ingo.Wilken[:at:]informatik[:dot:]uni-oldenburg.de)